比较Python中的计数器列表

您可以将每个计数器转换为键、值(项)元组的冻结集,然后将其用作传递给计数器的元素(因为冻结集是可散列的),例如:

import random

from collections import Counter

random.seed(42)

counts = [Counter([random.randint(0, 2) for _ in range(10)]) for _ in range(10)]

uniques = {frozenset(e.items()): e for e in counts}

counters_count = Counter(map(lambda e : frozenset(e.items()), counts))

for key, count in counters_count.items():
    print uniques[key], count

输出

Counter({0: 7, 1: 2, 2: 1}) 1
Counter({1: 4, 2: 4, 0: 2}) 1
Counter({0: 4, 1: 4, 2: 2}) 2
Counter({0: 4, 1: 3, 2: 3}) 1
Counter({0: 5, 2: 3, 1: 2}) 1
Counter({1: 5, 2: 5}) 1
Counter({0: 5, 1: 4, 2: 1}) 1
Counter({0: 4, 2: 4, 1: 2}) 1
Counter({2: 4, 0: 3, 1: 3}) 1

Counter 柜台 .

在Python中>=3.7有更好的方法。因为 柜台 dict 字典 现在保持它们的顺序,就可以使用每个 柜台

from collections import Counter

li = [Counter({'a': 1, 'b': 2, 'c': 3}),
      Counter({'a': 1, 'b': 2, 'c': 4}),
      Counter({'a': 1, 'b': 3, 'c': 3}),
      Counter({'a': 1, 'b': 2, 'c': 3})]


Counter.__hash__ = lambda counter: hash(str(counter))

print(Counter(li))
# Counter({Counter({'c': 3, 'b': 2, 'a': 1}): 2,
#          Counter({'c': 4, 'b': 2, 'a': 1}): 1,
#          Counter({'b': 3, 'c': 3, 'a': 1}): 1})